1.2 + 2.2 ^{2} + 3.2 ^{2} + … + *n* .2 ^{ n } = ( *n* – 1) 2 ^{ n } ^{+1} + 2

this question is solved on this site...... but I can't understand how the final answer came ..... please see 4.1's 8th question on this site ......

1.2 + 2.2 ^{2} + 3.2 ^{2} + … + *n* .2 ^{ n } = ( *n* – 1) 2 ^{ n } ^{+1} + 2

this question is solved on this site...... but I can't understand how the final answer came ..... please see 4.1's 8th question on this site ......

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