Question

an=7-6n find sum of 25th term​

Answer 1

αη=7-6η

η=1,2,3,.....

α(1)=7-6(1)

=>α1=1

α(2)=7-6(2)

=>7-12

=> -5

ᴅ=--

ᴅ=-

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

S25=25/2[2×1+(25-1)(-6)]

=>25/2[2-144]

=>25/2×(-142)

=>25×(-71)

=>-1775 is the ans

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