Question

1. The first term of AP is 5 ,last term is 45 and the sum is 400. Find number of
terms and common difference.​

Answer 1

Answer:

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Answer 2

Answer:

$a = 5 \\ an = 45 \\ sn = 400 \\ n = find \\ d = find \\ sn = n \div 2(a + an) \\ 800 = n \times 50 \\ n = 16 \\ an = a + (n - 1)d \\ 45 = 5 + (16 - 1)d \\ 40 = 15 \times d \\ 40 \div 15 = 8 \div 3 = d$

Step-by-step explanation:

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