Question

show that 7, 10 1/2, 14.....84 are in AP and find the sum of them​

Answer 1

Step-by-step explanation:

a=7

d=7/2

then we calculate n and we get n=23

then we apply sum of ap term

s23=23/2(7+84)

s23=23/2*91

sn23=1046 1/2

Answer 2

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