The Total solution for NCERT class 6-12
Given:
Number of red flags =4
Number of white flags= 2
Number of green flags= 3
So there are total 9flags, out of which 4 are red, 2 are white, 3 are green
By using the formula,
n!/ (p! × q! × r!) =9! / (4! 2! 3!)
= [9×8×7×6×5×4!] /(4!×2×1×3×2×1)
= [9×8×7×6×5] /(2×3×2)
= 9×4×7×5
= 1260
Hence, 1260 differentsignals can be made.