the second and fourth term of AP are 12 and 20 respectively then find the sum of first 25 terms
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the second and fourth term of AP are 12 and 20 respectively then find the sum of first 25 terms
i hope that the answer is 24000
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57
Answer
t2=12
t4=20
So as per the condition
t1=8
t3=16
Therefore, a=8 and d=4
Sn=n/2×(2a+(n-1)d)
S25= 25/2×(2×8+(25-1)4)
= 25/2×(16+96)
= 25/2×112
= 25×56
= 1400
Therefore, S25=1400
Hope it will help you
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