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Find the sum 5 xx 7 +7xx9+ 9 xx 11 +11x...

Find the sum `5 xx 7 +7xx9+ 9 xx 11 +11xx13+ 13 xx 15 +` ……. upto n terms.

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Find 3.7 + 5.10 + 7.13 + 9.16 + … upto 'n' term.