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Consider the following in respect of prime number p and composite number c.
1. (p + c)/(p - c) can be even. 2. 2p + c can be odd.…
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Three of the five positive integers p, q, r, s, t are even and two of them are odd (not necessarily in order). Consider the following:
1. p + q + r – s – t is definitely even. 2. 2p…
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What is the sum of all digits which appear in all the integers from 10 to 100 ?
(UPSC CSAT - 2023) 855 856 910 911 Solution: Ans.(2.) Every non-zero digit (1, 2,…
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Each digit of a 9-digit number is 1. It is multiplied by itself. What is the sum of the digits of the resulting number?
(UPSC CSAT - 2023) 64 80 81 100 Solution: Ans.(3.) 111111111×111111111 = 12345678987654321 Sum of…
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A number N is formed by writing 9 for 99 times. What is the remainder if N is divided by 13?
(UPSC CSAT - 2023) 11 9 7 1 Solution: Ans.(1.) As we know 1001 =…