“∑n2 = n(n+1)(2n+1)/6” has been added to your cart. Continue shopping Product Price Quantity Subtotal Make a Cube Puzzle ₹260.00 Make a Cube Puzzle quantity ₹260.00 ∑n2 = n(n+1)(2n+1)/6 ₹420.00 ∑n2 = n(n+1)(2n+1)/6 quantity ₹420.00 Coupon: Cart Totals Subtotal ₹680.00 2.5% CGST ₹6.50 2.5% SGST ₹6.50 9% CGST ₹37.80 9% SGST ₹37.80 Total ₹769.00 Continue Shopping Checkout