which term of G.P 3,9,27........is 2187
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take Sn =2187
a=3 , d= 6
put the formula as Sn=n/2[ 2a +( n- 1)d]
now put the values
a=3 , d= 6
put the formula as Sn=n/2[ 2a +( n- 1)d]
now put the values
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