Question

Sum of first hundred numbers common to the AP is 12,15,18....and 17,21,25...is

Answer 1

a = 12 , d= 15-12= 3 , n=100

Sn=n/2(2a+(n-1)d

S100 = 100/2[2x12+(100-1)3]

S100 = 50 (24+99x3)

S100 = 16050

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