Gate Exam Numerical Ability Permutation and Combination

2,12,360,__,174636000.

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2
2^2*3=12
2^3*3^2*5=360
2^4*3^3*5^2*7=75600
2^5*3^4*5^3*7^2*11=174636000
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Gate Other Question

3+5+6=12 18 72
5+5+6=25 30 94
5+6+7=30 35 85
5+5+3=25 15 73
9+4+7=? ? ? there are two candidates p and q in an election.During the
campaign,40% of the voters promised to vote for P ,and rest
for Q.however, on the day of election 15% of the voter went
back on their promise to vote for P and instead voted for Q.
25% of the voters went back on their promise to vote for Q
and instead voted for P.suppose,P lost by two votes,then
what was the total no. of voters.